This episode contains strong language and scenes of violence. 

Over the past five years, police officers in the United States have killed more than 400 unarmed drivers or passengers — a rate of more than one a week, a Times investigation has found.

Why are such cases so common, and why is the problem so hard to fix?

Guest: David D. Kirkpatrick, a national correspondent for The New York Times. 

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Background reading: 

• Officers, trained to presume danger, can react with outsize aggression during traffic stops — sometimes with fatal consequences.

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